Sewing machine for joining fabrics



4 Sheets-Sheet 1 .Fan. 10, 1933. F. M. QARD SEWING MACHINE FOR JOININGFABRICS Filed May 28, 1930 4 $heets-Sheet 2 Filed May 28, 1930 0 m J I 6z F 9 1? 0 M 9 m r a. $1 15 1 E4 w HM 6. I 17 M B Eim 1 ,fl lu 2 U15 ?1U 4 mm, H 7 7 m. 6 5 J mm m 5 1 5 y 1... 1 III I? 1 I W/ a Jan. 19,1933.

WAMM

Jan. 10, 1933. F. M. CARD SEWING MACHINE FOR JOINING FABRICS Filed May28, 1930 4 Sheets-Sheet 3 gwumtoz fiedera'e 1Z1. Cara? Wimw Jan. 10,1933. F. M. CARD SEWING MACHINE FOR JOINING FABRICS Filed May 28, 1930 4Sheets-Sheet 4 [If 44 I14 116 $5- 11 Patented Jan. 10, 1933 FEEDER-IOMI. CARD, OF BBIDGEPORT, COIINECTECUT, ASSIGNOB Q3? FELZZABET'E, EYE-WMANUFACTURER CG'MPD NY, NEW JERSEY SE'WIIIG- IEAGHEINE F03 Applicationfiled I-Eay 28,

This invention relates to improvements in sewing machines and has forits primary object to provide a machine capable of eiiir ciently joiningmaterials, particularly rayon and knit-goods materials, by a stitchedseam free from the bulkiness which is a characteristic of the butt-seamsproduced by sewing machines employed commercially for buttseam joiningof materials.

The foregoing and other objects and vantages in view, together withmeans whereby the same may be carried into effect, will best beunderstood from the following de- 1: scription of a preferred embodimentof the invention illustrated in the accompanying drawings, in which:

Fig. 1 is a longitudinal section, partly in front elevation, of thesewing i achine. Fig.

2 is a sectional view sub tant'iaily on the line 2-2 of Fig. 1. Fig. 318 a front end elevation, partly in section, the sewing machine with theupper portion 0 bracket-arm omitted. Fig. i is a vies, the line H ofFig. 8. Fig.

'-' side elevation, partly in section, of the press er-foot of themachine, including a sectional view of the throat-plate and feed-dogs. 6is a top plan view of the throat-plate. Fig.

m 7 is a bottom plan view of the machine bedplate. Fig. 8 is a sectionalview of the bracket-arm supporting base, substantially, on the line 88of Fig. 1. Fig. 9 is a detail View in elevation of the primaryfeed-lever actum ating crank. Fig. 10 is a rear side elevation,

i partly in section, of the. feed-levers. Fig. 11 is a rear side elev ofthe presser-foot and trimming mechanism. 2 epresents 1 4. JUN Aperspective views partly in section, of the presser-foot and thesupportuig bracket thereof, one of the foot-plates in dottec lines. 13is t of the presser-foot work-engao'l omitting the guard blocks and theau iliary foot. Fi' represents perspective views of the feedand theircarriers. is a sectional view of the machine bracket-arm, substantiallyon the l'n 15 of 1.

deferring to the drawings, tee sewing machine is shown as having a framecomprising a bed-plate 1 from one end of which rises a TO THE SINGERJERSM.., A CORPORATION OF L'a'ZINING FABRICS ieee. Serial no. 456,280.

tubular, supporting base 2 for the standard 3 of a tubular bracket-arm4, which overhangs the bed-plate 1 and terminates in a head 5. Risingfrom the bed-plate 1, below the bracket-arm head 5, is a tubularworksupporting post 6 of which the front end comprises swing-outclosure-plate 7 pivotally connected by a hinge 8 to the base-flange 9 ofthe post 6. Suitably secured upon the pper end of the post 6 is athroat-plate 10, having a plurality of parallel feed-dog slots, as 11and 12, and a transverse needle-slot 13. As illustrated moreparticularly in Figs. 5 and 6 of the drawings, the rear wall of theneedle-slot 18 is partly cut away to provide a recess 14 in the upperface of the throatplate inclined downwardly toward said slot 13, saidrecess 14 affording a clearance for a chainingbfi finger 15 of which theunderside is inclined upwardly toward its free end and which fingerextends across the needle-slot 13 to overlie the recess 1% in spacedrelation thereto, with the upper face of said finger substant ally flushwith the upper surface of the throat-plate. The chaining-off finger 15is in the present case formed integral with a ridged fabric-marginsupporting member 16 whose crest 17 is disposed centrally of andparallel with the line of seam formation and terminates in advance ofthe needle-slot 13 in a downwardly inclined surface 18 merging into theupper face of the chaining-off finger. The member 16 is removablydisposed in a recess 19 formed in the upper face of the throat-platebetween the front feed-dog slots 11 and 12', said member 16 beingsecured to the throat-plate by screws, as 20.

Journaled for rotation in suitable bearings provided in the braclretarm41 is a main actuating shaft 21, carrying at its outer end a drivingpulley 22 and at its opposite end a crank-disk 23. This crank-dishserves to actuate in the usual manner a link 24 operatively connectedwith a vertically disposed needlebar 25 journaled for endwisereciprocation in alined bearing apertures provided in a swinging frame26. The frame 26 is suspended from a fulcrum-pin 27 to swing about anaxis transverse to the axis of rotation of the main-shaft 21 and derivesits vibratory movements about the fulcrum-pin 27 from actuatingmechanism constructed substantially in accordance with the disclosure inthe U. S. patent to C. F. Gray, No. 1,020,089, Mar. 12, 1912. Ingeneral, a pitman 28 of which one end is connected with the frame 26 hasat its opposite end a split-strap 29 embracing an eccentric 30. Theeccentric 30 is adj ustably secured upon a shaft 31 disposed below andcrosswise of the main shaft 21, which latter has gear connections withthe transverse shaft 31 of a character such that the shaft 31 rotates atone-half the speed of rotation of the main-shaft. The needle-bar 25carries at its lower end a needle 32, which through the describedconnections and in combination with work-feeding mechanism isreciprocated endwise and vibrated laterally to effect the production ofzigzag stitches.

Cooperating with the needle 32, below the throat-plate 10, is aloop-taker 33 of the rotary-hook type, said loop-taker carrying a massof under thread around which the needle-thread loops are cast in theformation of lock-stitches. The actuating mechanism for the loop-taker33 is substantially the same as disclosed in my prior Patent No.1,729,994, Oct. 1, 1929. In general, the loop-taker is carried by ashort, horizontally disposed shaft 34 carrying a bevel-gear 35 in meshwi h a similar gear 36 upon the upper end of a vertically disposed,intermediate shaft 37 journaled in bearings provided within the post 6.At its lower end, the shaft 37 carries a bevelgear 38 driven by a gear39 fixed upon the forward end of a loop-taker actuating shaft 40journaled in suitable bearings provided at the under side of thebed-plate 1. The ratio of the gears 38 and 39 is such that the verticalshaft 37 rotates twice for each rota tion of the shaft 40. Secured uponthe shaft 40 is a pulley 41 connected by a belt 42 with a pulley 43 uponthe main-shaft 21, the shaft 40 rotating once for each rotation of saidmain-shaft.

To intermittently advance the work past the needle, there is employed adifferential feeding mechanism comprising a main feeddog 44 operatingthrough the feed-slots 11 in the throat-plate and an auxiliary feed-dog45 operating through one of the feed-slots 11 and the feed-slot 12. Themain feed-dog 44 has a lateral shank 46 secured by screws, as 47, upon aprimary feed-dog carrier 48 from which projects a reinforcing lug 49underlying the shank 46 of the feed-dog. The feed-dog carrier 48 has atransverse aperture 50 entered by a pivot-stud 51 projecting laterallyfrom the upper end of a vertically directed, primary feed-lever 52. Thefeedlever 52 intermediate its ends has a transversely apertured hub 53pivotally mounted upon a fulcrum-pin 54 disposed crosswise of thedirection of feed and suitably fixed in bearing-bosses, as 55, withinthe frame post 6.

At its lower end, the feed-lever 52 is forked to embrace a slide-block56 pivotally carried by a crank-arm 57 upon the forward end of a hollowmain feed rock-shaft 58 journaled in bearing lugs, as 59, depending fromthe bedplate 1. At its rearward end, the rock-shaft 58 carries acrank-arm 60 pivotally connected with the lower end of a pitman 61, ofwhich the upper end has a strap 62 embracing an eccentric 63 adj ustablysecured upon the mainshaft 21 in substantially the manner disclosed inthe U. S. patent to 1V. F. Dial et al., No. 718,988, Jan. 27, 1903.

The auxiliary feed-dog 45 also has a lateral shank 64 secured by screws,as 65, upon a feed-dog carrier 66 which likewise has a laterallyextending reinforcing lug 67 underlying the shank 64. The carrier 66 hasan upstanding ear 68 from which projects laterally a pivot-stud 69entering an aperture in the upper end of a secondary feed-lever 7Odisposed adjacent and extending in the same general direction as theprimary feed-lever 52. The arrangement of the feed-levers and feed-dogcarriers is such that adjacent sides of the latter are disposed insliding engagement with each other, whereby they are materiallystrengthened against lateral stresses. The feed-dog carriers are furthersteadied by an arm 70 projecting laterally from the secondary feed-lever70 and bent upwardly at its free end to slidingly engage the outer sideof the primary feed-clog carrier 48. The carrier lugs 49 and 67 arearranged in substantial alinement in the direction of feed, the rear lug49 of the main feed-dog carrier overhanging the upper edge of theauxiliary carrier 66 adjacent the car 68 thereof.

The secondary feed-lever 70 also has intermediate its ends an aperturedhub 71 pivotally mounted upon the hub 53 of the feed-lever 52. At itslower end, the secondary feed-lever 70 is forked to embrace aslide-block 7 2 pivotally carried by a crank-arm 73 having a split hub74 clamped upon the forward end of an auxiliary feed. rock-shaft 75journaled in the main feed rock-shaft 58 with its opposite endsprojecting beyond said rock-shaft 58. Suitably fixed upon the otherprojecting end of the auxiliary rock-shaft 75 is an arm 76 having asegmental groove 77 in the side thereof remote from the shaft end.Shift-ably disposed in. said groove 77 is a slide-block 78 pivotallyconnected with one end. of a link 79 of which the opposite end isconnected by a pivot-bolt 80 with the pitman 61 intermediate the endsthereof.

Consequently the rock-shaft 75 is actuated by the reciprocatorymovements of the pitman 61 which impart rocking movements to the shaft58. However, the extent of movement of the rock-shaft 75 may nadjustably varied relatively to the rocking movements of the shaft 58.For this purpose, the slide- "lock 'Z8 is also pivotally connected "it-hone end of a link 81 of which the opposite end is connected in likemanner with a rock-arm 82 having a hub 83 fixed upon a sleeve 81journaled upon a fulcrum-shaft 85 disposed substantially parallel withthe main-shaft 21. The fulcrum-shaft 85 is fixed in suitable bearingsprovided in opposite walls of the bracket-arm base 2. The sleeve 84;carries a wormwheel 86 in engagement with a worm 87 fixed upon anadjusting shaft 88 journaled in bearings in the front and rear Walls ofthe base 2, said adjusting-shaft 88 being disposed crosswise of andabove the rock-shaft 85. The front bearing for the adjusting shaft 88comprises a shouldered bushing 89, suitably fixed in an aperture in thebase 2 and integral with a segment-plate 90 disposed in front of saidbase 2. The segment-plate 90 has an arcuate slot 91 in whichstop-members 92 and 93 are adjustably fixed.

Suitably secured upon the end of the adjusting shaft 88, which projectsforwardly beyond the segment-plate 90, is an adjustingarm 9% havingoffset end 95 overhanging the segment-plate 90. Threaded through theoffset end 95 of the adjusting-arm is a securing screw 96 adapted toengage the circular periphery of said segment-plate, whereby the arm 91may be adjustably clamped to th fixed segment-plate in different angularpositions of said arm 94 and consequently in different positions of theslideblocl: 78 with respect to the axis of the rockshaft 75.

Rising and fallingmovements are imparted to the feed-dogs insubstantially the manner disclosed in my before mentioned prior PatentNo. 1,729,991. In brief, this mechanism comp-rises a vertically disposedfeed-lift bar 97 to the lower end of which is adjustably secured a fork98 straddling an eccentric 99 upon the loop-taker actuating shaft 10.The feed-lift bar 97, which is journaled for endwise reciprocation insuitable bearings provided within the post 6, has at its upper end fork100 pivotally carrying between its members a pair of guide-blocks, as101. The feed-dog carriers 4-8 and 66 are respectively provided withsubstantially horizontally directed slots 102 and 103 at their endsopposite to the iivotal connections of said carriers with the feed-bars,a guide-block 101 being slidingly disposed within each of said slots102, 103. It will be understood from the foregoing description thatwork-advancingand return movements areimparted to the feed-dogs 44 and45 by the feed-levers 52 and 7 0, d that rising anl falling movementsare imparted to the feed-dogs about their pivotal connections with saidfeed-levers by the feed-lift bar 97. The extent of work-advancingmovement of both feed-dogs may be determin d by adjustment of theeccentric 63 upon the main-shaft 21. the stroke of the auzc iliaryfeed-dog 15 being controlled independently of that of the primaryfeed-dog 44 by adjustment of the arm 94, as above described.

Opposed to the feed-dogs is a presser-foot carried by a main presser-bar104; guided for vertically directed endwise movements in suitablebearings provided in the bracketarm head 5. This main resser-bar isyieldingly depressed by the usual spring (not shown) and may be raisedand lowered by any manually operated means commonly employed for thispurpose. Upon the lower end of the presser-bar 104 is secured by a screw105 a presser-foot supporting bracket 106, of which aportion of itsfront face has a rectangular recess 107 having its spaced side wallsvertically disposed. Snugly seated in the recess 107 and secured thereinby a screw 108 is the vertically disposed, flattened shank 109 of thepresser-foot, this construction providing not only for ready removal ofthe presser-foot from the machine but also for accurately attaching itto the presserbar. Projecting horizontally forward from opposite ends ofthe shank 109 are guidemembers 110 and 111 provided with verticallyalined apertures in which are slidingly disposed the vertically directedauxiliary presser-bars 112 and 113. The lower ends of these auxiliarybars carry horizontally disposed shoes 11% and 115 entering thechanneled heels 116 and 117 of presser-foot plates 118 and 119, whichrespectively terminate in upturned toes 120 and 121 and are pivotallymounted upon the shoes 114, 115 by horizontally disposed pivot pins, as122, passing through the spaced members of the U shaped heels in adirection crosswise of the line of feed.

The foot-plates 118, 119 are yieldingly depressed independently of eachother by springs 123 and 124 coiled about the auxiliary presser-bars112, 118, said springs being interposed between the upper guide-member110 of the presser-foot shank and collars 125 and 126 adjustably securedupon the bars 112, 113 to yieldingly rest upon the lower guide-member111 and thereby limit the downward movement of the foot-plates 118, 119.The collars 125, 126 each have a depending guide-fin 127 slidinglydisposed in a suitable guide-slot in the lower guide-member 111, wherebythe bars 112, 113 are confined to vertically directed movements.

The foot-plates 118, 119 are spaced from each other beginning from thetoes 120, 121 thereof to form a fabric-margin slot 128 which terminatesat a point directly in front of the needle path, at which point theadjacent edges of the foot-plates curve inwardly into abutting relationto together form a split guide-web 129 which serves to deflect under thepresser-foot the upwardly directed fabric margins passing through theslot 128. The guide-web 129 which also terminates in front of theneedle-path, is comparatively narrow in the direction of seam formation,the adjacent edges of the foot-plates rearwardiy of said guide-web beingcut away to merge into the foot-plate heels 116, 117.

This construction of the foot-plates provides a substantial spacebetween the heels 116, 117 thereof, in which space is disposed anauxiliary or chaining-off foot having its toe spaced rearwardly from theguideweb 129 in the line of scam formation to provide a needle slot 131in the presser-foot. The auxiliary foot 130 is preferably rigidlycarried by a shouldered guide-bar 132 of which the lower portion isslidingly disposed in a vertically directed aperture provided in aguide-block 133 upon the presser-foot shank 109. The reduced upper endof the guidebar 132 is disposed within a screw-bushing 134 adjustablythreaded into the upper side of the guide-block 133, a spring 135 coiledabout the reduced portion of the guide-bar being interposed between thebushing 134 and the shoulder of the guide-bar. The foot 130 has anupturned heel 136 which overlies a bent stop-plate 137 secured by ascrew 138 upon the rear side of the presser-foot shank 109, wherebydownward movement of the foot 130 under the action of the spring 135 islimited. It will be observed that the crest 17 of the fabric-marginsupporting member upon the throat-plate rises substantially centrally ofthe presser-foot slot 128 and that it is in alinement with the auxiliaryfoot 130.

The machine is provided with a mechanism for trimming the upturnedfabric-margins passing through the presser-foot slot 128, said mechanismin the present instance including a horizontally disposed ledger-blade139 and a horizontally vibratory cuttingblade 140 resting upon theledger-blade, the cutting edges of said blades meeting in shearingrelationship directly above the foot slot 128 and in advance of theguide-web 129.

The ledger-blade 139 is rigidly clamped in a split head 141 of a collar142 suitably secured upon the lower end of a vertically slidable rod 143jonrnaled in spaced lugs 144 formed on an auxiliary bracket 145 securedby screws as 146, upon a primary bracket 147 fixed by screws, as 148,upon the rear side of the machine head 4. The rod 143 is restrainedagainst oscillation about its longitudinal axis by a forked guide-collar149 adjustably c rried by said rod and embracing a guide-rib 150 on thebracket 145. Underlying the collar 149 is a lip 151 projecting laterallyfrom a stop-member 152 secured for vertical adjustment upon thepresser-foot supporting bracket 106. The stop-member 152 limits thedownward movement of the rod 143, the adjustment being preferably suchthat the ledger-blade clears the presscr-foot plate 118 a sufficientdistance to allow for rocking movements of the foot-plate 118 about itspivotal support while riding uneven portions of the work. Thestop-member 152 also functions to raise the trimmer-blades when thepresser-foot is raised for insertion and removal of work. It will beobserved that the described construction furthermore provides for adjustably raising and lowering the trimming position with respect to thework-support.

The cutting-blade 140 is rigidly clamped in a holder-collar 153 carriedby a rod 154 slidably disposed in vertically alined apertures providedin spaced lugs, as 155, projecting forwardly from a rock-arm 156. Aspring 157 is coiled about the rod 154 and is interposed between theupper of the lugs and a forked guide-collar 158 adjustably secured uponthe rod above the lower lug 155, whereby the cutting-blade 140 isyieldingly urged into engagement with the ledger-blade 139 which itoverlies. The rock-arm 156 has a split hub 159 clamped by a screw 160upon a sleeve 161 journaled for oscillatory movements upon a verticallydisposed fulcrumpin 162 fixed in vertically spaced bearin lugs, as 163,upon the primary bracket 14 7. Projecting laterally from the upper endof the sleeve 161 is an arm 164 connected by an extensible link 165 withan arm 166 depending from one end of a horizontally disposed rockshaft167 journaled in a bracket 168 suitably secured to the underside of themachine bracket-arm 3. The other end of the rock-shaft 167 carries acrank-arm 169 pivotally connected with a pitman 170 having a strapembracing an eccentric 171 upon the main shaft 21. It will be observedthat the ledger-blade 139 and its supporting means can be removed fromthe machine independently of the other blade supporting means bydetaching the auxiliary bracket 145 from the machine bracket-arm, andthat the entire trimmer-blade supporting mechanism can be removed as aunit from the machine by detaching the primary bracket 147.

Secured upon the foot-plates 118, 119, for individual detachmenttherefrom and disposed adjacent to the fabricslot 128 therebetween, areguard-blocks 172 and 173 provided in their under faces with recesses 174and 175 affording the necessary clearance for the trimmer-blades 139,140, which project through said recesses, to allow the foot-plates 118,119 to rock slightly about their pivotal supports during the passage ofthe work without affecting the trimming position. The side face 176 ofthe guard-block 173 adjacent the slot 128 is gradually curved towardsits rearward end to extend across said slot 128 and merge with therearward wall of a slot 177 formed in the guard-block 172, whereby thetrimmed-01f portion of the work is diverted laterally out of the seamline. Conforming with the diverting-surface curvature of said blocks anddisposed directly thereabove in its operative position so as tocooperate with said surface in deflecting the trimmed-off fabricmargins, is a diverterblade 17 8 having its shank 179 bent to closelyembrace the ledger-blade carrying collar 142. The curved shank 179 ofthe diverter blade has a horizontally elongated slot 180 entered by thestop-screw 181 threaded into said collar and passing through a frictionwasher 182. This construction provides simple supporting means for thediverter-blade, permitting the blade to be readily swung into and out ofoperative position. Because the function of diverter-blades of thischaracter is well known, the drawings show the blade as swung into itsineffective position to more clearly illustrate the mechanism 1npartobscured by the blade in its operative position.

In its passage to the needle from a suitably located supply, theneedle-thread 1s led through guide apertures, as 183, formed 1n spacedthread-guiding arms, as 184, suitably secured upon the removablecover-plate 185 of the machine bracket-arm. Between said arms, thethread is passed through an aperture 186 in a pull-off lever-arm 187 proectlng through a suitable opening (not shown) in the cover-plate 185.The pull-0E lever 1s secured intermediate its ends upon a rockingfulcrum-pin 188 journaled in a pair of brackets, as 189, suitably fixedto the underside of said cover-plate 185. At its lower end, the pull-offlever is bifurcated to provide a fork 190 straddling an eccentric 191upon the malnshaft 21. Adjustably secured upon the fulcrum-pin 188, asby a set-screw 192, is an arm 193 positioned to engage the lower end ofa vertically disposed nipper-pin 194 Secured upon the upper end of thepin 194 is a clampdisk 195 urged by a spring 196 into engagement withthe upper face of a nipper-member 197 fixed upon the cover plate 185.The thread-nipper referred to is located between the pull-0E arm 187 andthe usual take-up arm 198, the needle thread after leaving the pull-01fdevice passing under the clamp-disk 195 and through the thread-guide 199to the take-up.

From an inspection of Fig. 2 of the drawings, it will be observed thatthe pull-off arm 187 moves forwardly from between the thread-guides 184to pull thread from the supply at the time that the nipper-pin 194 isdepressed to cause the clamp-disk 195 to nip the thread and that thenipper-pin 194 is raised by the arm 198 during the return movement ofthe pull-off arm 187 to give up the thread pulled from the supply.

Any suitable or well known means may be employed for releasing thethread-nipper, as for instance for the purpose of removing the work fromthe machine. In the present machine there is employed a nipper-releasinglever 200 which is fulcrumed upon the machine bracket-arm 4 and hasoperative connections (not shown) with the usual presserfoot liftingmeans. The lever 200 has a wedge-shaped nose 201 positioned to enterbetween the clamp-disk 195 and the nippermember 197 when thepresser-foot is raised, to thereby release the thread.

V In order to join fabric plies by a butt seam, the marginal portions ofsuch plies upon the work-supporting post are directed upwardly to passthrough the presser-foot slot 128, whereupon the shearing elements 139,140 trim said margins and the trimmed ofl' surplus is directed laterallyout of thepath of the needle by the merging diverting surfaces of theguard-blocks 172, 173, aided by the diverter blade 17 8. The trimmed ofimargins of the plies are then forced downwardly into abutting relationby the presser-foot guideweb 129 during the advance of the work by thefeeding mechanism. As the auxiliary feed-dog 45 operates only at oneside of the line of seam formation, it acts only upon one of thefabric-plies and accordingly this ply may be more or less shirred byadjusting the stroke of said auxiliary feed-dog with respect to that ofthe main feed-dog 44. It will be understood, of course, that in order tofull or gather both fabric plies it is only necessary to employ anauxiliary feed-dog shaped to eX- tend upon opposite sides of the line offeed.

The abutting fabric plies are joined by a zigzag-stitch seam formed bythe vertically reciprocating and laterally vibrating needle 32 inconjunction with the loop-taker mechanism beneath the throat-plate. Thepresserfoot plates 118, 119 are each capable of riding uneven portionsof the work by reason of their pivotal and bodily yielding support uponthe presser-foot body and can readily adapt themselves to differences inthicknesses of the fabric plies being joined. The auxiliary foot 130rides the seam formed and, as usual, opposes a portion of the feed-dogin the absence of work to assist in chaining off.

While the seam formed by the present machine is not in itself novel, itpresents advantageous characteristics over the multiple-needle,cross-thread seam employed for joining fabric sections, in that it isless bulky, requires only a relatively small quantity of thread and hasmore than ample strength to securely join the fabrics. particularlydesigned to conveniently handle the work and to join fabric sections ata high speed of operation.

Having thus set forth the nature of the invention, What 1 claim hereinis 1. Feeding mechanism for sewing machines including a feed-dogcarrier, a feed rock-shaft, operative connections with said rock-shaftfor transmitting work-advancing and return movements to said feed-dogcarrier, a crank-arm carried by the feed rockshaft, an actuatingelement, a'shiftable member connecting said element and the crankarm,and means for shifting said member endwise of said crank-arm foradjustably determining the extent of work-advancing movement of thefeed-dog carrier comprising, a rock-arm operatively connected with themember, a feed-adjusting shaft, intermeshing gears coaxial with saidfeed-adjusting shaftand rock-arm, and means for actuating thefeed-adjusting shaft.

2. Feeding mechanism for sewing machines including a feed-dog carrier, afeed rock-shaft, operative connections with said rock-shaft fortransmitting work-advancing and return movements to said feed-dogcarrier, a crank-arm carried by the feed rockshaft, an actuatingelement, a shiftable member connecting said element and the crankarm,and means for shifting said member endwise of said crank-arm foradjustably cletermining the extent of work-advancing movement of thefeed-dog carrier comprising, a rock-arm operatively connected with theshiftable member having its fulcrum-axis substantially parallel with thefeed rockshaft, a feed-adjusting shaft disposed transversely of saidrock-arm fulcrum-axis, wormgearing connecting the feed-adjusting shaftwith said rock-arm, and an operating member carried by thefeed-adjusting shaft.

3. Feeding mechanism for sewing machines including a feed-dog carrier, afeed rock-shaft, operative connections with said rock-shaft fortransmitting work-advancing and return movements to said feed-dogcarrier, a cra11k-arm carried by the feed rockshaft, an actuatingelement, a shiftable member connecting said element and the crankarm,and means for shifting said member endwise of said crank-arm foradjustably determining the extent of work-advancing movement of thefeed-dog carrier comprising, a rock-arm operatively connected with theshiftable member having its fulcrum-axis substantially parallel with thefeed rockshaft, a feed-adjusting shaft disposed transversely of saidrock-arm fulcrum-axis, wormgearing connecting the feed-adjusting shaftwith said rock-arm, astationary segmentplate, an operating membercarrier by the feed-adjusting shaft, means for adjustably securing saidoperating member to the segment-plate in angularly different positionsof said feed-adjusting shaft, and stop-members carried by saidsegment-plate for adjustment into different positions in the path ofmovement of said operating member.

4. In a sewing machine having a bed-plate, a vertically disposedwork-supporting post rising from said bed-plate, a reciprocatory needle,a loop-taker housed Within said post, a pair of feed-dog carriersdisposed within the upper end of said post with adjacent sides of saidcarriers in sliding engagement, a pair of vertically directedfeed-levers within the post pivotally connected at their upper ends withthe feed-dog carriers a coaxial pivotal 7 support for said feed-leversintermediate the ends thereof, actuating mechanism connected with thelower ends of said feed-levers for imparting work-advancing movements tothe feed-dog carriers, a vertically reciprocatory feed-lift bar withinthe post, means for actuating said bar, and connections with thefeedlift bar for imparting rising and falling movements to both of thefeed-dog carriers.

5. A differential feeding mechanism for sewing machines comprising mainand auxiliary feed-dog carriers disposed with adjacent vertical sidesthereof in sliding engagement, a pair of vertically disposed feed-leverspivotally connected with said carriers, one of said feed-levers having abent arm slidingly embracing both of the feed-dog carriers, a coaxialpivotal support for the feed-levers, actuating mechanism for rockingsaid feedlevers including means whereby the stroke of one feed-dogcarrier may be varied with respect to that of the other, and avertically reciprocatory feed-lift bar for imparting rising and fallingmovements to both of said feed-dog carriers.

6. In a sewing machine having a bed-plate, a vertically disposedwork-supporting post rising from said bed-plate, a reciprocatory needle,a loop-taker housed within said post, a rotary loop-taker actuatingshaft journaled beneath the bed-plate, a pair of feeddog carriersdisposed Within the upper end of the post, a pair of vertically disposedfeedlevers within the post pivotally connected at their upper ends withthe feed-dog carriers, a coaxial pivotal support for said feedleversintermediate the ends thereof, coaxial feed rock-shafts journaledbeneath the bedplate operatively connected with the feedlevers, meansfor actuating said rock-shafts, means accessibly presented to anoperator in the operative position of the machine for efi'ectingadjustment of the stroke of one feedlever with respect to that of theother, a vertically reciprocatory feed-lift bar within the post, andmeans for actuating said feed-lift bar from the loop-taker actuatingshaft.

7. Differential feeding mechanism for sewing machines comprising, mainand auxiliary feed-dogs, means for imparting rising and fallingmovements to said feed-dogs, and means for imparting w0rk-advancing andreturn movements to the feed-dogs including a pair of coaxially arrangedfeed rock-shafts, a pitman operatively connected with one of saidrock-shafts, a crank-arm carried by the other rock-shaft, a membershiftably disposed upon said crank-arm, a link-connection between saidmember and said pitman, a rockarm operatively connected with theshiftable member, and adjusting means including gear connections wit-hsaid rock-arm for determin- 7 ing the effective action of saidlink-connection upon the rock-shaft crank-arm, whereby the extent ofwork-advancing movement of one feed-dog may be adjusted with respect tothat of the other feed-dog.

In testimony whereof, I have signed my name to this specification.

FREDERIG M. CARD.

